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TI-2021-15623 Aliases CVE-2021-37759GHSA-f9j4-c45h-7xwv

A Session ID leak in the DEBUG log file in Graylog before 4.1.2 allows attackers to…

Priority MEDIUM 45CWE-532Published · Updated

Key facts

Attack vector
Network
Privileges required
None
User interaction
None
Attack complexity
Low
Impact type
Information disclosure
Confidentiality · integrity · availability
High · High · High
Fix status
No fix listed

Attack profile from CVSS 3.1 · NVD. Fix status from CNA. Impact type from CWE-532.

Summary

A Session ID leak in the DEBUG log file in Graylog before 4.1.2 allows attackers to escalate privileges (to the access level of the leaked session ID).

Why it matters now

EPSS 0.01286 70th percentileScored 2026-11-07
Fix No fix listed No fixed version in the sources yet

SSVC decision points

Not available: CISA has not published SSVC decision points for this record.

Affected products

VendorProductAffected versionsFixed inStatusSource
——all versions—No fix listedCNA
  • — Vendor— Affected all versions Fixed in — No fix listed CNA

CPE configurations NVD · 1

CPEVersionsRoleVendor
cpe:2.3:a:graylog:graylog:*:*:*:*:*:*:*:*0.20.0 to before 4.1.2VulnerableGraylog2
  • cpe:2.3:a:graylog:graylog:*:*:*:*:*:*:*:* Versions 0.20.0 to before 4.1.2 Vulnerable ·Graylog2

Remediation

No fixed version listed by the sources yet.

Timeline

  1. 2026-10-02 Threatist record created from CVE-2021-37759
  2. 2026-10-03 Alias added: GHSA-f9j4-c45h-7xwv

References

Advisory 1

  • TI-2024-16341 graylog2-server vulnerable to instantiation of arbitrary classes triggered by API request CVSS 3.1HIGH 8.8
  • TI-2023-21671 Insecure source port usage for DNS queries in Graylog CVSS 3.1MEDIUM 5.3
  • TI-2026-01133 Incorrect management of session invalidation vulnerability in Graylog Web Interface CVSS 4.0CRITICAL 9.3
  • TI-2023-21667 User session is still usable after logout in graylog2-server CVSS 3.1LOW 3.1
  • TI-2021-15624 A Session ID leak in the audit log in Graylog before 4.1.2 allows attackers to escalate… CVSS 3.1CRITICAL 9.8
  • TI-2025-33099 Graylog vulnerable to privilege escalation through API tokens CVSS 4.0HIGH 8.8
See all 21 →

Sources

This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences